Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
App Overview
Nineteen Days
# Nineteen Days
$5.99
PRICE
$5.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
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What's included
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Differentiate and validate
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
# Nineteen Days **Your Bahá’í Calendar, Everywhere.** Stay connected to the Bahá’í calendar throughout your day with Nineteen Days Widget, a beautifully designed calendar companion for iPhone and iPad. Discover today's Badí‘ date, follow the nineteen-month calendar, remember Holy Days and Feasts, and make time for prayer, meditation, and reflection in your daily life. ### Features **Bahá’í Calendar** - View today's Badí‘ date alongside the Gregorian calendar. - Explore the nineteen months of the Bahá’í year. - Follow calendar days that begin at sunset. - Keep track of upcoming Holy Days and Feasts. **Beautiful Home Screen Widgets** - Display the Bahá’í date directly on your Home Screen. - Explore calendar dial and upcoming-event widgets. - Access useful calendar information without opening the app. **Holy Day & Feast Reminders** - Receive notifications for upcoming Holy Days and Feasts. - Choose reminders three days in advance. - Customize notification preferences and reminder times. **Meditation & Reflection** - Make time for quiet meditation and personal reflection. - Incorporate moments of stillness into your daily routine. - Support a balanced daily rhythm of prayer, meditation, and remembrance. **Prayer & Remembrance** - Set reminders for obligatory prayers. - Access remembrance prayers throughout the day. - Personalize prayer notifications to support your daily routine. **Qiblih Direction** - Find the direction of the Qiblih with the built-in compass. - Access Qiblih information through supported widgets. **Sunset-Based Calendar** - Follow the Bahá’í day as it begins at sunset. - Use location-aware sunset calculations for accurate calendar transitions. Nineteen Days Widget brings the beauty and meaning of the Bahá’í calendar into everyday life through a simple, thoughtful experience. **Developed by Nineteen Days, LLC** Support: [email protected] Website: https://nineteendays.com Note: The Nineteen Days Calendar app is not affiliated with or endorsed by the Bahá'i World Centre. It is an independent product created by Nineteen Days for the convenience of Bahá'is worldwide. About Badi Calendar The Badi calendar, adopted by the Bahá'i Faith, is a solar calendar composed of nineteen months and four or five intercalary days. The beginning of the year occurs at the equinox in spring. Each month has its name representing a virtue (e.g., Perfection, Mercy), as do the days of the week. This calendar was initiated in 1844 when the Báb began to spread His teachings.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
BUILD KIT DIFFICULTY
Not assessed in a Build Kit yet.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.
